I really didn't want to post in this forum, since it is one I don't frequent myself much, but it seems the appropriate place to ask the question...

On this thread the gentleman posted an attachment, which I will attach on this post. I tried to upload the image in the zip file, but it was not recognized as a valid format (there is a clue there somewhere I think).

If I open the image using Windows Picture and Fax Viewer (part of Window's XP package) I get a marvelously detailed image I can zoom up on quite nicely, the image is very well done. However, if I try to open it up with paint it comes out totally different, black background instead of white, with most of the detail lost. So what is the difference?

I view myself as a graphic type on this site, so this was an unpleasant surprise that could have good consequences for my education. Thanks.

I am guessing it is an older version or at least a different flavor of jpg that plain vanilla Paint doesn't like. I replicated your results. You can invert the colors to get rid of the black background, but resolution is still miserable. Then tried a CS2 version of Photoshop. It would not open, and I got an error indicating it was the wrong file type. It did open in WordPerfect 11 with the same colors as in Fax Viewer but with a little less resolution.

WP11 dates back a few years, so maybe that has something to do with the compatibility.

Wow. Guys, didn't realize that this will be so much of a mystery..here is what I've done..

As you probably realized, I made this schematics in ProLite ISIS, (free on the web btw). The here is the sequence:

1) File- export graphics-export metafile-tick "colour output" and untick "erase backgorund" - save file as "----" on desktop
2) It comes up with .emf extension, I just changed it to .jpg (just favour the name, not really using .emf a lot, but .jpg is well known)

3) When I tried to load it to thread, the file format wasn't recognized, as expected.